fetch.c
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fetch.c
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	#include <compat.h> // IWYU pragma: keep

	#include <uv.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <tlsuv/tlsuv.h>
	#include <tlsuv/http.h>
	#include <utarray.h>

	#include "ant.h"
	#include "errors.h"
	#include "common.h"
	#include "internal.h"
	#include "runtime.h"
	#include "modules/fetch.h"
	#include "modules/json.h"
	#include "modules/timer.h"

	typedef struct {
	char *data;
	size_t size;
	size_t capacity;
	} fetch_buffer_t;

	typedef struct fetch_request_s {
	ant_t *js;
	jsval_t promise;
	tlsuv_http_t http_client;
	tlsuv_http_req_t *http_req;
	fetch_buffer_t response_buffer;
	int status_code;
	int completed;
	int failed;
	char *error_msg;
	jsval_t headers_obj;
	char *method;
	char *body;
	size_t body_len;
	} fetch_request_t;

	static UT_array *pending_requests = NULL;

	static void free_fetch_request(fetch_request_t *req) {
	if (!req) return;

	if (req->response_buffer.data) free(req->response_buffer.data);
	if (req->error_msg) free(req->error_msg);
	if (req->method) free(req->method);
	if (req->body) free(req->body);

	free(req);
	}

	static void remove_pending_request(fetch_request_t *req) {
	if (!req \|\| !pending_requests) return;

	fetch_request_t **p = NULL;
	unsigned int i = 0;

	while ((p = (fetch_request_t**)utarray_next(pending_requests, p))) {
	if (*p == req) { utarray_erase(pending_requests, i, 1); break; }
	i++;
	}
	}

	static jsval_t fetch_fail_oom(ant_t js, jsval_t promise, fetch_request_t req, bool close_http, const char *msg, size_t len) {
	jsval_t err = js_mkstr(js, msg, len);
	js_reject_promise(js, promise, err);
	if (close_http) tlsuv_http_close(&req->http_client, NULL);
	remove_pending_request(req); free_fetch_request(req);
	return js_mkundef();
	}

	static jsval_t response_text(ant_t js, jsval_t args, int nargs) {
	jsval_t this = js_getthis(js);
	jsval_t body = js_get_slot(js, this, SLOT_DATA);

	jsval_t promise = js_mkpromise(js);
	js_resolve_promise(js, promise, body);

	return promise;
	}

	static jsval_t response_json(ant_t js, jsval_t args, int nargs) {
	jsval_t this = js_getthis(js);
	jsval_t body = js_get_slot(js, this, SLOT_DATA);
	jsval_t parsed = js_json_parse(js, &body, 1);
	jsval_t promise = js_mkpromise(js);

	if (vtype(parsed) == T_ERR) {
	js_reject_promise(js, promise, parsed);
	} else js_resolve_promise(js, promise, parsed);

	return promise;
	}

	static jsval_t create_response(ant_t js, int status, const char body, size_t body_len) {
	jsval_t response_obj = js_mkobj(js);
	jsval_t body_str = js_mkstr(js, body, body_len);

	js_set(js, response_obj, "ok", js_bool(status >= 200 && status < 300));
	js_set(js, response_obj, "status", js_mknum(status));

	js_set_slot(js, response_obj, SLOT_DATA, body_str);

	js_set(js, response_obj, "text", js_mkfun(response_text));
	js_set(js, response_obj, "json", js_mkfun(response_json));

	return response_obj;
	}

	static void complete_request(fetch_request_t *req) {
	if (req->failed) {
	jsval_t err = js_mkstr(req->js, req->error_msg ? req->error_msg : "Unknown error", req->error_msg ? strlen(req->error_msg) : 13);
	js_reject_promise(req->js, req->promise, err);
	} else {
	const char *body = req->response_buffer.data ? req->response_buffer.data : "";
	size_t body_len = req->response_buffer.data ? req->response_buffer.size : 0;
	jsval_t response = create_response(req->js, req->status_code, body, body_len);
	js_resolve_promise(req->js, req->promise, response);
	}

	remove_pending_request(req);
	free_fetch_request(req);
	}

	static void on_http_close(tlsuv_http_t *client) {
	fetch_request_t req = (fetch_request_t )client->data;
	if (req && req->completed) complete_request(req);
	}

	static void body_cb(tlsuv_http_req_t http_req, char body, ssize_t len) {
	fetch_request_t req = (fetch_request_t )http_req->data;

	if (len == UV_EOF) {
	req->completed = 1;
	tlsuv_http_close(&req->http_client, on_http_close);
	return;
	}

	if (len < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)len));
	req->completed = 1;
	tlsuv_http_close(&req->http_client, on_http_close);
	return;
	}

	if (req->response_buffer.size + len > req->response_buffer.capacity) {
	size_t new_capacity = req->response_buffer.capacity * 2;
	while (new_capacity < req->response_buffer.size + len) new_capacity *= 2;
	char *new_data = realloc(req->response_buffer.data, new_capacity);

	if (!new_data) {
	req->failed = 1;
	req->error_msg = strdup("Out of memory");
	req->completed = 1;
	tlsuv_http_close(&req->http_client, on_http_close);
	return;
	}

	req->response_buffer.data = new_data;
	req->response_buffer.capacity = new_capacity;
	}

	memcpy(req->response_buffer.data + req->response_buffer.size, body, len);
	req->response_buffer.size += len;
	}

	static void resp_cb(tlsuv_http_resp_t resp, void data) {
	(void)data;
	fetch_request_t req = (fetch_request_t )resp->req->data;

	if (resp->code < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(resp->code));
	req->completed = 1;
	tlsuv_http_close(&req->http_client, on_http_close);
	return;
	}

	req->status_code = resp->code;
	resp->body_cb = body_cb;
	}

	static jsval_t do_fetch_microtask(ant_t js, jsval_t args, int nargs) {
	(void)args;
	(void)nargs;

	jsval_t current_func = js_getcurrentfunc(js);
	jsval_t url_val = js_get(js, current_func, "url");
	jsval_t options_val = js_get(js, current_func, "options");
	jsval_t promise = js_get_slot(js, current_func, SLOT_DATA);

	char *url_str = js_getstr(js, url_val, NULL);
	if (!url_str) {
	jsval_t err = js_mkstr(js, "Invalid URL", 11);
	js_reject_promise(js, promise, err);
	return js_mkundef();
	}

	fetch_request_t *req = calloc(1, sizeof(fetch_request_t));
	if (!req) {
	jsval_t err = js_mkstr(js, "Out of memory", 13);
	js_reject_promise(js, promise, err);
	return js_mkundef();
	}

	req->js = js;
	req->promise = promise;
	req->headers_obj = options_val;

	req->response_buffer.capacity = 16384;
	req->response_buffer.data = malloc(req->response_buffer.capacity);
	req->response_buffer.size = 0;

	if (!req->response_buffer.data) {
	jsval_t err = js_mkstr(js, "Out of memory", 13);
	js_reject_promise(js, promise, err);
	free(req);
	return js_mkundef();
	}

	utarray_push_back(pending_requests, &req);

	const char *scheme_end = strstr(url_str, "://");
	if (!scheme_end) return fetch_fail_oom(js, promise, req, false, "Invalid URL: no scheme", 22);

	const char *host_start = scheme_end + 3;
	const char *path_start = strchr(host_start, '/');
	const char *at_in_host = NULL;

	for (const char *p = host_start; p < (path_start ? path_start : host_start + strlen(host_start)); p++) {
	if (*p == '@') at_in_host = p;
	} if (at_in_host) host_start = at_in_host + 1;

	size_t scheme_len = scheme_end - url_str;
	size_t host_len = path_start ? (size_t)(path_start - host_start) : strlen(host_start);

	const char *path = path_start ? path_start : "/";
	if (host_len == 0) return fetch_fail_oom(js, promise, req, false, "Invalid URL: no host", 20);

	char *host_url = calloc(1, scheme_len + 3 + host_len + 1);
	if (!host_url) return fetch_fail_oom(js, promise, req, false, "Out of memory", 13);
	snprintf(host_url, scheme_len + 3 + host_len + 1, "%.s://%.s", (int)scheme_len, url_str, (int)host_len, host_start);

	int rc = tlsuv_http_init(uv_default_loop(), &req->http_client, host_url); free(host_url);
	if (rc != 0) return fetch_fail_oom(js, promise, req, false, "Failed to initialize HTTP client", 33);

	req->http_client.data = req;
	req->method = NULL;
	req->body = NULL;
	req->body_len = 0;

	if (is_special_object(options_val)) {
	jsval_t method_val = js_get(js, options_val, "method");
	if (vtype(method_val) == T_STR) {
	char *str = js_getstr(js, method_val, NULL);
	if (str) {
	req->method = strdup(str);
	if (!req->method) return fetch_fail_oom(js, promise, req, true, "Out of memory", 13);
	}
	}

	jsval_t body_val = js_get(js, options_val, "body");
	if (vtype(body_val) == T_STR) {
	size_t len;
	char *str = js_getstr(js, body_val, &len);
	if (str && len > 0) {
	req->body = malloc(len);
	if (!req->body) return fetch_fail_oom(js, promise, req, true, "Out of memory", 13);
	memcpy(req->body, str, len);
	req->body_len = len;
	}
	}
	}

	if (!req->method) {
	req->method = strdup("GET");
	if (!req->method) return fetch_fail_oom(js, promise, req, true, "Out of memory", 13);
	}

	req->http_req = tlsuv_http_req(&req->http_client, req->method, path, resp_cb, req);
	if (!req->http_req) return fetch_fail_oom(js, promise, req, true, "Failed to create HTTP request", 30);
	req->http_req->data = req;

	char user_agent[256];
	snprintf(user_agent, sizeof(user_agent), "ant/%s", ANT_VERSION);
	tlsuv_http_req_header(req->http_req, "User-Agent", user_agent);

	if (is_special_object(options_val)) {
	jsval_t headers_val = js_get(js, options_val, "headers");
	if (is_special_object(headers_val)) {
	ant_iter_t iter = js_prop_iter_begin(js, headers_val);
	const char *key;
	size_t key_len;
	jsval_t value;

	while (js_prop_iter_next(&iter, &key, &key_len, &value)) {
	char *value_str = js_getstr(js, value, NULL);
	if (value_str) {
	char *key_str = strndup(key, key_len);
	if (key_str) { tlsuv_http_req_header(req->http_req, key_str, value_str); free(key_str); }
	}
	}
	js_prop_iter_end(&iter);
	}
	}

	if (req->body && req->body_len > 0) {
	tlsuv_http_req_data(req->http_req, req->body, req->body_len, body_cb);
	}

	return js_mkundef();
	}

	static jsval_t js_fetch(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "fetch requires at least 1 argument");
	if (vtype(args[0]) != T_STR) return js_mkerr(js, "fetch URL must be a string");

	jsval_t url_val = args[0];
	jsval_t options_val = nargs > 1 ? args[1] : js_mkundef();

	jsval_t promise = js_mkpromise(js);
	jsval_t wrapper_obj = js_mkobj(js);

	js_set_slot(js, wrapper_obj, SLOT_DATA, promise);
	js_set_slot(js, wrapper_obj, SLOT_CFUNC, js_mkfun(do_fetch_microtask));

	js_set(js, wrapper_obj, "url", url_val);
	js_set(js, wrapper_obj, "options", options_val);

	queue_microtask(js, js_obj_to_func(wrapper_obj));

	return promise;
	}

	void init_fetch_module() {
	utarray_new(pending_requests, &ut_ptr_icd);
	js_set(rt->js, rt->js->global, "fetch", js_mkfun(js_fetch));
	}

	int has_pending_fetches(void) {
	return pending_requests && utarray_len(pending_requests) > 0;
	}

	void fetch_gc_update_roots(GC_OP_VAL_ARGS) {
	if (!pending_requests) return;
	unsigned int len = utarray_len(pending_requests);
	for (unsigned int i = 0; i < len; i++) {
	fetch_request_t reqp = (fetch_request_t )utarray_eltptr(pending_requests, i);
	if (reqp && *reqp) {
	op_val(ctx, &(*reqp)->promise);
	op_val(ctx, &(*reqp)->headers_obj);
	}
	}
	}

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